the answer is -$97 for sure.
6 U: X6 c) a9 \tvb now,tvbnow,bttvbThink about it this way
: k: g" r0 X# M' t1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18) L K+ f# X! r9 W0 y1 ^) N) Y$ {
2) Now, the owner discovered that the 100 bucks is fake. You can think this as a lost of $100. therefore the overall gain is $3-$100 = -$97 |
發表於 2007-5-16 03:12 AM
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發表於 2007-5-19 03:21 PM
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發表於 2007-5-21 03:49 AM
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